有关struts中返回结果是字符串的问题

        <action name="next_*" class="*****************" method="{1}" >
            <result name="list">/jsp/qlNextPlanList.jsp</result>           
            <result name="edit">/jsp/qlNextPlanEdit.jsp</result>
            <result name="createNextMonthPlan">/jsp/qlNextPlanCreate.jsp</result>
            <result type="stream">
                   <param name="contentType">text/html</param>
                   <param name="inputName">inputStream</param>
            </result>
        </action>   

    private InputStream inputStream;
    public InputStream getInputStream() {
        return inputStream;
    }
    public void setInputStream(InputStream inputStream) {
        this.inputStream = inputStream;
    }